package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Employee;
import com.itheima.reggie.entity.User;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    //ant风格匹配路径
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {

        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //1、获取本次请求的URI
        String requestURI = request.getRequestURI();// /backend/index.html

        log.info("拦截到请求：{}",requestURI);

        //定义不需要请求的处理路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //2、判断本次请求是否需要处理
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                filterChain.doFilter(request, response);
                return;
            }
        }

        //3、判断登录状态，如果已登录，则直接放行
        HttpSession session = request.getSession();

        Employee employee = (Employee) session.getAttribute("loginEmployee");
        if (employee!=null){
            Employee loginEmployee = (Employee) request.getSession().getAttribute("loginEmployee");
            Long id = loginEmployee.getId();
            BaseContext.setCurrentId(id);
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
            log.info("用户未登录");
            //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
            R<Object> notlogin = R.error("NOTLOGIN");
            String jsonString = JSON.toJSONString(notlogin);
            response.getWriter().write(jsonString);
            return;



    }
}
